Seattleites are pretty good over all. Especially if you're wearing a miniskirt/skort!
I had someone honk at me once because I was in the left turn lane, but I think they were just confused. (we didn't have the green arrow yet) Maybe they thought they needed to be over the sensors to trip the turn light. (this was one that my bike does trip, and almost immediately)
I'm lucky in that I ride a designated bike route for most of my commute. Those green "Bike Route" signs help keep the cars on their toes. And there isn't much car traffic.
Edit: I think rural drivers are good with bikes because they have dealt with slower vehicles (and been the drivers of slower vehicles) like tractors and horses and such. They seem to treat bikes like horses or farm machinery. They have a "slow vehicle protocol" that city drivers don't have. Besides, they know your mom probably knows their mom from the library or the Cenex, so they better behave! (my mom knows darn near everyone, and knowlege is power!)
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson